React 19 deprecation warning: InternalMosaicWindow2 accesses element.ref

[printfn]

I'm seeing this deprecation warning when using React 19:

Accessing element.ref was removed in React 19. ref is now a regular prop. It will be removed from the JSX Element type in a future release. Component Stack: 
    InternalMosaicWindow2 MosaicWindow.tsx:64
    ConnectedInternalMosaicWindow MosaicWindow.tsx:260
    MosaicWindow2 react-mosaic-component.js:8857
    div unknown:0
    div unknown:0
    MosaicRoot2 MosaicRoot.tsx:15
    div unknown:0
    MosaicWithoutDragDropContext2 react-mosaic-component.js:7861
    DndProvider2 DndProvider.tsx:28
    Mosaic2 react-mosaic-component.js:7994

It would probably make sense to access element.props.ref and fall back to element.ref if that doesn't exist.